package com.lhn.filter;

import com.lhn.entity.User;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * @author lhn
 * @date 2024-10-16 16:43
 */

@Component
@WebFilter(urlPatterns = {"/index.html"}, filterName = "userFilter")
public class UserFilter implements Filter{
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(
            ServletRequest servletRequest,
            ServletResponse servletResponse,
            FilterChain filterChain
    ) throws IOException, ServletException {
        //
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpSession session = request.getSession();
        User user = (User) session.getAttribute("user");
        if (user == null) {
            response.sendRedirect("/login.html");
        } else {
            filterChain.doFilter(servletRequest, servletResponse);  // 放行
        }
    }

    @Override
    public void destroy() {

    }
}
